Louisville quarterback Teddy Bridgewater warms up before participating in passing drills for NFL representatives during pro day at the University of Louisville in Louisville, Ky., Monday, March 17, 2014.

A month ago, the feeling was that four quarterbacks would go in the top 10 of the NFL Draft, including a team reaching to draft Fresno State’s Derek Carr because he wouldn’t be available later in the first round.

Because the Texans (Ryan Fitzpatrick), Browns (Brian Hoyer), Raiders (Matt Schaub) and Vikings (Matt Cassel) have followed the Jaguars’ lead in adding or retaining a veteran quarterback (Chad Henne), momentum has shifted as the May 8 draft gets closer.

“There’s the theory going around of, ‘Let’s build up our roster with as many talented players as we can and then we can insert the quarterback,’” NFL Network analyst Daniel Jeremiah said. “Teams have brought in or re-signed a veteran that is functional and that will allow them not to force it in the draft.”

A league source thinks Bortles will be the first quarterback off the board — “to somebody in the first five or six picks. … But based on a lot of things that could play out, you might see Bridgewater fall into the late part of the first round.”

Bortles, Bridgewater, Carr and Manziel are the consensus top quarterbacks. Looking at them in nine categories, here’s how they stacked up against each other.

SIZE

Bortles: At 6-foot-4 and 230 pounds, he has the ideal build for an NFL quarterback.

Bridgewater: It’s a concern. Listed at 205 pounds last year, he checked into the scouting combine at 214, but a month later at his pro day, was back down to 208 pounds. He’s tall enough (6-foot-2), but can his frame take the normal NFL pounding?

Carr: At a shade below 6-2 1/2 and 214 pounds, he should be OK if he keeps the weight on.

Manziel: A big concern for durability purposes. At the scouting combine, Manziel was 5-11 6/8 and 207 pounds and looked like a high school kid running the 40-yard dash.

ACCURACY

Bortles: He completed 67.8 percent of his passes (259 of 382) last year for UCF, which ranked 10th in FBS. During his pro day last month in Orlando, Borltes was 56-of-65 passing with five drops.

Bridgewater: One evaluator had Bortles, Bridgewater and Manziel tied for the best in this category. Last year, he led the nation by completing 71 percent of his passes (303 of 427).

Carr: According to STATS, Inc., 21.7 percent of his throws last year were screen passes and his shaky bowl game against Southern Cal raised questions. His 68.7 completion rate was sixth in the nation but obviously misleading because of the offensive style.

Manziel: For a quarterback who is on the move so much, evaluators think his accuracy is just as good as Bortles and Bridgewater. Manziel completed 69.9 percent of his passes last year, third in the nation.

ARM STRENGTH

Bortles: Experts say Bortles can drive the football down the field and also has good velocity on passes when forced to throw off-balance.

Bridgewater: Insiders say he has room to grow in terms of ball placement and others added that Bridgewater’s arm strength is good but not great.

Carr: The strongest arm among the top quarterbacks, and it’s pretty much unanimous. Despite Fresno State’s offense being screen-game heavy, he showed during Senior Bowl week he can make all of the throws.

Manziel: He has enough strength to make all the throws, but his at-times faulty mechanics — off the back foot, against his body, etc. — could be costly in the NFL.

MOBILITY

Bortles: For a big guy, Bortles still rushed for 557 yards and 14 touchdowns his last two years of college, and he has good footwork in the pocket,

Bridgewater: Credited with 170 rushing yards in three seasons, so he’s not considered a dual-threat quarterback. But he slides around enough to keep plays alive.

Carr: Although his athleticism is underrated, it’s a question of how well Carr can move once he lines up under center. He was almost exclusively in the shotgun at Fresno State.

Manziel: Off the charts. He rushed 345 times for 2,169 yards and 30 touchdowns in two years. When he tries to extend the play, he is terrific at making something out of nothing.

DECISION MAKING

Bortles: One of the knocks on Bortles is that he takes too many risks, throwing while on the move into windows that are quickly closed by the defender. He had 19 interceptions in 37 games.

Bridgewater: Was ranked No. 1 in this category by one source. Threw only 24 interceptions in 1,142 attempts for Louisville.

Carr: Had a tendency to rush passes when defenses sent extra rushers. A knock was his accuracy in a game’s most important moments.

Manziel: The challenge for Manziel is to not use his athleticism on every play, instead letting his guys get open as he stays in the protected pocket.

LEADERSHIP

Bortles: One evaluator put Bortles as the top leader among the four quarterbacks. He has showed during the pre-draft process that he will easily blend into an NFL locker room and players will follow him.

Bridgewater: Called a “natural” leader by one draft publication, he is probably a lead-by-example player at this point.

Carr: Grouped by one source in the same area as Bridgewater and Manziel, one notch below Bortles.

Manziel: Despite some immature episodes on and off the field, it’s clear teammates followed him at A&M.

LEVEL OF COMPETITION

Bortles: Starting one year apiece in Conference USA and the American Athletic Conference, Bortles faced only four ranked opponents — UCF lost at No. 14 Ohio State in 2012. Last year, the Knights lost to No. 12 South Carolina at home but won at No. 8 Louisville and beat No. 6 Baylor in the Fiesta Bowl.

Bridgewater: Started two years in the Big East and one year in the AAC and had only two games against ranked competition. He won against No. 24 West Virginia in 2011 and No. 4 Florida in the Sugar Bowl as a sophomore.

Carr: This where Carr comes up particularly short in the rankings. The Bulldogs played in the WAC for one year and the Mountain West for two years when Carr was the starter. He went 0-4 against ranked teams (Boise State twice and Oregon/Nebraska once apiece) and went 0-2 in bowl games.

Manziel: In just two years, he played 10 games (five each season) against ranked teams, going 4-1 as a freshman and 1-4 as a sophomore. He burst onto the stage by helping A&M to a win at No. 1 Alabama in 2012.

EXPERIENCE

Bortles: A two-year starter for the Knights, Bortles was 22-5 and played 10 games (110 pass attempts) as a redshirt freshman.

Bridgewater: After redshirting in 2010, he started 38 games (29-9 record).

Carr: A fifth-year senior, Carr played five games in 2009 when the other three quarterbacks were still in high school. He went 24-14 as a starter and attempted 1,630 passes.

Manziel: The only sophomore among the group, he started for two years and attempted 863 passes.

@ california jagjetuar: Yep, Murray and carr are the toss up, and an SEC guy, knowing he's been coached up and by whom, I'd take Murray over every QB in this draft, not waiting, with my second round pick. Then at 5th round go for another one for the practice squad. Meanwhile, get an extra pick for your 3rd overall, and maybe take Tre mason with 20-25th pick, Murray, a center ( I like the Arkansas kid), and a WR before an OG and CB. The key for us to win is on offense. Bringing TT in would only help by giving us a veteran back up or upgrade as starter. The vanilla offense with MJD was too esay for defenses to stop. how many 3 and outs?

Caveman I am with you on JM but not with the three pick. My hopes for the upcoming draft have been Watkins, or best available player, where we currently sit. If we go for a QB in the first round, I think it's worth the gamble to trade down and acquire another high pick. If we gamble and lose then so be it, but I would feel we overpaid for JM at number three. I know we sparred about this the other day, and it pains me dearly to agree with SOS, but I am liking Murray more and more in the 2nd round. I know he has his flaws, and I have an SEC bias, but I can't shake all the Drew Brees comparisons.

I am with you ! Jim from Purdue. It seems some of the great college QBs don't quite produce the same magic in the NFL as they did at their schools. But some QBs do surprise us with the "it factor". Johnny Football is the only QB in the draft that has displayed the IT factor. Sure he does have some negatives, but his talent at the position should overcome them and with time he could become one of the great ones. IMO. He will be in the league for some team for a very long time as a feature QB. Go Jags!

Johnny Manziel, has one factor not on the charts, or much mentioned in these articles, he has that "it" factor that has enabled A&M to win close games in the last few minutes. None of the others in this year's draft has consistently shown that combination of daring, skill and moxie.

Sunday's chart is great, but I don't think it addresses this, admittedly somewhat intangible, quality. But you see it in Brady, Manning, saw it in Brees, even when he was at Purdue, and it is something almost all the other famous QBs have shared.

Another factor misses in the chart is intelligence and Manziel scored very highly there.

Johnny Manziel will succeed in the NFL despite not testing perfectly, and I hope he succeeds in Jacksonville as Johnny Jaguar!